CN103027766B - The bite-resistant acetabular bone liner of self centering - Google Patents

Abstract

The present invention provides a kind of liner being adapted for insertion in the acetabular shell of arthroplasty of hip.Described liner includes engaging capital concave inside surface.Described liner also includes the outer surface that can engage described acetabular shell and the edge extended between described inner surface and described outer surface.Described outer surface includes the lock part extended from described edge, the complex bend part extended at First Transition point from described lock part, and the dome portion from the extension of described complex bend part, wherein at described First Transition point, described complex bend part is tangent with described lock part.

Description

The bite-resistant acetabular bone liner of self centering

Technical field

Present invention relates generally to the implant used in plastic surgery operations.

Background technology

Joint in human body forms two or more skeletons or other bone pars muscularis divide between attachment structure.Ankle, hip, Knee joint, shoulder, elbow and wrist are only the several examples in the internal numerous joints that can find.From joint listed above, example is permissible It is evident that many joints allow the relative motion between skeleton.Such as, joint can have slip, sliding, hinged or ball-and-socket Motion.Such as, ankle allows to carry out pivotal motion, and knee joint allows to carry out the combination of sliding and pivotal motion, and takes on and allow to pass through with hip Ball-and-socket is arranged and is moved.

Internal joint is stressed, or may be the most damaged.Such as, joint is through making continuously for many years With, joint there will be and gradually wear and tear and tear.The joint allowing motion has the cartilage being positioned between skeleton, to carry For the lubrication to motion, and also more arthrotropic power are led in absorption.Elapsing in time, the normal of joint uses possible abrasion soft Bone, and the skeleton in motion is in direct contact with one another.By contrast, during normal use, from accident (such as automobile thing Therefore) wound (such as transmitting bigger power) in joint may be caused to skeleton, cartilage or other connective tissues such as tendon or Sizable injury of ligament.

Arthrosis, it is intended that the term of joint disease, be joint may become damage another way.Behave most ripe The joint disease known is arthritis, and it is commonly referred to as causing pain, swelling, the joint disease of stiff, unstable and frequent deformity Disease or inflammation.

There is the arthritis of many multi-forms, wherein osteoarthritis is most commonly seen, and it is by IA soft Abrasion and the tear of bone are caused.The arthritis of another type is osteonecrosis, and it is to make bone owing to lacking blood supply The part necrosis of bone is caused.Other kinds of arthritis is caused by the wound in joint, and such as rheumatoid joint Inflammation, lupus and other arthritic lesions cartilages of psoriatic arthritis, and relevant to the inflammation of joint internal layer.

Hip joint is to be frequently subjected to a kind of joint that arthrosis torments.Hip joint is to connect femur or Thigh bone and pelvis Ball-and-socket joint.Pelvis has half ball-and-socket being referred to as acetabular bone, and it is for receiving the ball-and-socket head in femur.The head of femur and hip Mortar is coated with cartilage, to allow femur to be prone in pelvis motion.Be frequently subjected to arthrosis torment other joints include spine, The phalanges of knee joint, shoulder, carpal bone, metacarpal bone and hands.The arthroplasty relative with arthrosis is often referred to as manufacture of intraocular joint.Closing Under the arthropathic serious conditions of joint inflammation or other forms, such as when pain cannot be born or when the movable scope in joint Have in limited time, can have reason to consider with artificial articular portion or overall this joint of replacement.Certainly, for replace the process in joint with The concrete joint considered and change, but generally include the end replacing the skeleton tormented by slight illness by prosthetic joint implant End portion, and insert the component succedaneum for use as cartilage.

Prosthetic joint implant is by merging into joint offer intensity and the rigid material of hardness and selection with skeleton knot For providing lubrication for joint and absorbing the cartilage alternative means composition of some compression stresses.Suitable material for implant includes Metal and composite, such as titanium, cochrome, rustless steel, ceramic material, and the suitable material being used for cartilage substitute includes Polyethylene.Cement can also be used to prosthetic joint implant is fixed to host's skeleton.

Such as, overall hip is replaced and is included removing the spherical head of femur, and bar implant is inserted into the center of skeleton In, the center of this skeleton refers to spinal canal or the bone marrow of skeleton.Bar implant can with in cementation to spinal canal, or can have many The coating surface in hole, is directly brought together into implant for allowing skeleton.Bar implant has cervical region and spherical head, and it is used for Perform the function identical with the cervical region of healthy femur and spherical head.

Cup or shell can be placed directly onto in acetabular bone.Cup or shell can include the coating of porous, for promoting that skeleton is raw Long, thus shell is fixed to acetabular bone.Alternatively or additionally, shell can include opening or multiple opening, with For receiving nail, thus help shell is attached to acetabular bone.Cup can be made of metal, described metal such as cochrome, no Rust steel or titanium.Or, cup can be made up of ceramic material or polyethylene.In certain embodiments, cup directly engages head.At it In his embodiment, some kinds of liner is inserted in cup, with hinged against head.Liner can be by metal, pottery or poly- Ethylene is made.

Generally and ceramic-lined it is locked in metal in shell by taper lock, it is meant that shell includes bullet, and liner bag Include the corresponding bullet in the bullet that may be mounted to shell.When correctly installing, shell bullet and liner bullet are engaged with each other also Liner is locked in shell.But, during insertion, the bullet of liner may become the bullet with shell and cannot align, from And surface-surface locking expected from bullet cannot be formed.This is referred to as cross lock, it is characterised in that the edge of less stable or Multi-point fastening.If there is situation about cannot align during Cha Ruing, then implant fracture and appearance in operation process can be increased The risk of other complication.

When liner cross lock, surgeon has to decide on the liner being to leave cross lock position, attempts from shell Middle taking-up liner, still takes out whole implant structure.The liner of cross lock is stayed in shell and can bring multiple wind to patient Danger, including: abrasion increase, implant structure disintegration, the range of movement of non-optimal and implant fracture.From shell take out liner or Take out whole structure also to produce risk and increase postoperative complication.

Accordingly, it would be desirable to be able to eliminate or greatly reduce the liner that the bullet of cross lock connects.

Summary of the invention

According to one embodiment of present invention, it is provided that in being adapted for insertion in the acetabular shell of arthroplasty of hip Lining.This liner includes engaging capital concave inside surface.This liner also includes the outer surface that can engage acetabular shell And between inner surface and outer surface extend edge.Outer surface includes the lock part extended from edge, from First Transition point The complex bend part that the lock part at place extends, and the dome portion extended from complex bend part, wherein in the first mistake Crossing Dian Chu, complex bend part is tangent with lock part.

In another embodiment, it is provided that for the external member of arthroplasty.This external member includes shell and is inserted into Liner in shell.Liner includes inner surface and outer surface.Inner surface is generally concave, and outer surface can engage acetabular bone Shell.Outer surface includes lock part and complex bend part, and this complex bend part includes radial component and rectilinear tangential portion Point.

In another embodiment of the present invention, it is provided that liner.This liner is for arthroplasty and includes inner surface And outer surface.Outer surface can engage acetabular shell and include lock part and complex bend part.Complex bend part is from lock Determine partially tangentially to extend.

Accompanying drawing explanation

In order to be more fully understood from the present invention and advantage thereof, with reference now to following description with reference to the accompanying drawings, wherein:

Fig. 1 is the perspective view of the liner according to one embodiment of the present of invention.

Fig. 2 is the sectional view of liner shown in Fig. 1.

Fig. 3 is the zoomed-in view of a part for liner shown in Fig. 1.

Fig. 4 is to be superimposed upon the sectional view of liner shown in Fig. 1 of lining in prior art.

Fig. 5 is the sectional view that liner shown in Fig. 1 is combined with shell, and wherein liner is unjustified.

Fig. 6 is the sectional view that liner shown in Fig. 1 is combined with shell, in wherein liner is correctly positioned at shell.

Fig. 7 is the perspective view of the liner according to an alternative embodiment of the invention.

Fig. 8 shows the flow chart of the using method of liner according to an embodiment of the invention and shell.

Fig. 9 is the partial sectional view of liner shown in Fig. 1, figure has marked region according to an embodiment of the invention it Between multiple sizes.

Detailed description of the invention

By being best understood by embodiments of the invention and advantage thereof with reference to description below and accompanying drawing, the most identical is attached The parts that figure labelling is identical and corresponding in accompanying drawing.

Referring now to Fig. 1 and Fig. 2, figure shows liner 10 according to an embodiment of the invention.Liner 10 includes Inner surface (or supporting surface) 12.As it can be seen, the supporting surface 12 in this embodiment is generally concave.Supporting surface 12 quilt It is designed for being connected by joint with femoral head (not shown).Liner 10 also includes outer surface 14.Outer surface 14 is designed to Fit to (Fig. 5 and Fig. 6) in shell 16.Supporting surface 12 and outer surface 14 are connected between supporting surface 12 and outer surface 14 The edge 18 extended.In other words, edge 18 is between supporting surface 12 and outer surface 14.In this embodiment, supporting surface 12, outer surface 14 and edge 18 are all formed by single.In other embodiments, these sheets can be modular and be locked in Together.

Referring also to Fig. 1 and Fig. 2, below outer surface 14 is described in more detail.Outer surface 14 includes lock part 20, complex bend part 22 and dome portion 24.In this embodiment, dome portion 24 includes smooth top 24a, and this is common In the lining-design of some prior aries.It will be appreciated, however, that in some liners 10, can there is no smooth top.Lock Determine part 20 to extend from edge 18, and it is sized and shaped for engaging shell 16, as detailed below.In this embodiment In, lock part 20 is tapered wall but it also may use locking mechanism known to other.

In the embodiment shown in Fig. 1 and Fig. 2, complex bend part 22 includes two parts: radial component 25 is with tangential Part 26.In the illustrated embodiment, radial component is bending, and tangential part 26 is straight line.In other embodiments, cut Can also be bending to part 26, but its radius is different from the radius of radial component.As it is shown on figure 3, the figure shows compound The zoomed-in view of the liner 10 around sweep 22, lock part 20 is tangent with radial component 25 at transition point 28.Change sentence Words are said, radial component 25 tangentially extends from lock part 20.Owing to radial component 25 is tangent with lock part 20, therefore lock There is no edge between part 20 and radial component 25 and there is seriality.Radial component 25 is bending, has and sticking department Divide 20 tangent radius of circles, thus limit its center.

As in figure 2 it is shown, complex bend part 22 starts to extend from lock part 20 at the end point of lock part 20.? In some embodiments, there is no dome portion 24, and complex bend part 22 extends to the top of liner 10.

Referring now to Fig. 3, radial component 25 is tangentially dissolved in tangential part 26 at transition point 30.In other words, At transition point 30, tangential part 26 tangentially extends from radial component 25.Radial component 25 point 30 at tangential part phase Cut so that on liner 10, there is not edge or wedge angle.Tangential part 26 is straight line, it also with dome portion 24 at transition point 32 Tangent.In other words, tangential part 26 is the straight line the most tangent with radial component 25 and dome portion 24.Because have with this two The tangential part 26 that individual bending area 24,25 is the most tangent, so not having edge or turning, thus decreases coarse surface.? In embodiment shown in Fig. 1-3, tangential part 26 is straight line.In other embodiments, tangential part 26 can be bending.? In other embodiments, as in Fig. 7 it is further described that tangential part can not had.Complex bend part 22 can only include radially Part 25.

See Fig. 4, it is shown that liner 10 be superimposed upon on prior art liner (line 34).From the figure, it can be seen that composite bent Bent portions 22 stretches out from the respective external 34 of prior art liner.Non-shaded portion 35 table in this additional materials Fig. 4 Show.When assembling two sheets (as figure 5 below and Fig. 6 are further illustrated), the additional materials in liner 10 reduces liner 10 with outer Gap value between shell 16.

In certain embodiments, by the radius of radial component 25 being maximized the curvature determining radial component 25, with Time radial component 25 curvature still be able to be formed and radial component 25 and the most tangent tangential part 26 of dome portion 24.But, In other embodiments, other parameters may determine that the curvature of radial component 25.

Referring now to Fig. 5 and Fig. 6, figure shows the liner 10 inserted in shell 16.Shell 16 includes inner surface 36 He Outer surface 38.Outer surface 38 is designed to fit in the acetabular bone (not shown) that surgical operation prepares.Inner surface 36 includes locking Part 40, matches in its lock part 20 being designed to liner 10.In this embodiment, lock part 40 is bullet, It matches with the tapered lock portion 20 of liner 10.In this embodiment, the lock part 40 of shell 16 and liner 10, locking Part 20 is self-locking bullet known in the art.

When first liner 10 being introduced in shell 16, if lock part 20 and lock part 40 are unjustified, such as Fig. 5 institute Show, then liner 10 meeting " is floated " in shell 16, without flushing in shell 16.In other words, the edge 18 of liner 10 is not Flush with the edge 42 of shell 16.This allows user to guarantee, and the lock part 20 of liner 10, lock part 40 exist with shell 16 Align before placement.As it has been described above, complex bend part 22 includes the material (non-shaded portion 35 of Fig. 4) added, thus subtract Little gap between liner 10 and shell 16.Therefore, unless the lock part 20 of shell 16 and liner 10 and lock part 40 Alignment, otherwise complex bend part 22 can adjoin with shell, to prevent liner to be absorbed in certain position.Liner 10 and shell 16 align After, lock part 20, lock part 40 engage, and the lock part 40 of the lock part 20 of liner 10 and shell 16 completely in Conical contact, liner 10 and shell 16 can be placed the most as shown in Figure 6.If liner 10 is completely disposed in shell 16, liner The edge 18 of 10 is parallel to the edge 42 of shell 16.

Fig. 7 shows an alternative embodiment of the invention.This embodiment includes liner 50.Liner 50 includes lock part 52, complex bend part 54 and dome portion 56.In this embodiment, complex bend part 54 includes single sweep 58. In other words, there is no the rectilinear tangential part described in the embodiment of as above texts and pictures 1-6.The sweep of complex bend part 54 58 extend from the end point 55 of lock part.In certain embodiments, there is no dome portion 56, and complex bend part 54 is prolonged Extend the top of liner 10.In other embodiments having dome portion 56, complex bend part 54 incorporates dome at point 59 In part 56.In this embodiment, sweep 58 tangentially extends from lock part 52 and dome portion 56.

Referring now to Fig. 8, figure shows the using method of one embodiment of the present of invention.In step s60, by shell 16 Insert in acetabular bone (not shown).Liner 10, liner 50 are placed in shell (s62).If liner 10, liner 50 are not fixed, that User rotates liner 10, liner 50 (step s64), until it slips in shell 16 as shown in Figure 6.In some embodiments In, step s60 can be completed after liner 10, liner 50 being inserted in shell.In other words, liner/housing combination is permissible Assemble in situations in the surgery room, it is also possible to be previously assembled in monolithic case, wherein have pre-assembly liner together and Shell.User can be package shell and the surgeon of liner in operation process, it is also possible to be that device is carried out pre-group Dress, is then delivered to surgical someone by shell and Liner Components.

Referring now to Fig. 9, figure shows the partial sectional view of liner 10.In this embodiment, liner 10 has appearance Face 14, it includes lock part 20, complex bend part 22 and dome portion 24.Complex bend part 22 includes two parts: Radial component 25 and tangential part 26.Shown in Fig. 9 a embodiment lists multiple sizes in these parts and region.Such as figure Shown in, lock part 20 has the height 70 between about 0.250 inch and 0.300 inch.Lock part 20 have between Cone gauge diameter 72 between about 1.2 inches and 2.0 inches and the amount of taper between about 0.190 inch and 2.20 inches Rule position 74.Lock part 20 also has the cone angle 76 between 5 degree and 6 degree.

Radial component 25 has the knuckle radius 78 between 0.250 inch and 0.750 inch.Tangential flat Extend with the angle 80 between about 9.0 degree and 10.0 degree, and there is the length between about 0.10 inch and 0.15 inch Degree 82.

Although the present invention is easily affected by various modification and alternative form, but its specific embodiment the most in the accompanying drawings with Way of example illustrates, and will be explained in herein.It should be appreciated, however, that be not intended to limit the invention to disclosed herein Concrete form, but on the contrary, it is an object of the invention to contain the spirit falling into the present invention as defined by the appended claims With all modifications form, equivalents and the alternative form in scope.

Claims (4)

1. for an external member for arthroplasty of hip, including:

Acetabular shell；With

The acetabular bone liner being adapted for insertion in described acetabular shell, described liner includes:

It is adapted to engage with capital concave inside surface；

It is adapted to engage with the outer surface of described acetabular shell；And

The edge extended between described inner surface and described outer surface, wherein, described outer surface includes extending from described edge Lock part, the complex bend part that extends from described lock part at First Transition point, and from described complex bend The dome portion that part extends, wherein, at described First Transition point, described complex bend part and described sticking department split-phase Cut,

Wherein, described complex bend part includes radial component and the tangential part of straight line of bending, wherein, described radial component Extend from described lock part at described First Transition point, and wherein, described tangential part at the second transition point from institute State radial component to extend,

Wherein, described tangential part is tangent with described radial component at described second transition point,

Wherein, described dome portion extends from described tangential part at the 3rd transition point, and wherein, described tangential part is described At 3rd transition point tangent with described dome portion, and

Wherein, there is between described lock part and described radial component seriality and at described tangential part and described circle Top has seriality between dividing so that there is not edge or wedge angle on the outer surface of described acetabular bone liner.

External member the most according to claim 1, it is characterised in that described shell includes the sticking department being adapted to engage with described liner The lock part divided.

External member the most according to claim 2, it is characterised in that the lock part of described shell and the sticking department of described liner It is divided into self-locking bullet.

External member the most according to claim 1, it is characterised in that described dome portion includes smooth top.